class_docstr: Skill that takes a function usable by pandasai
code: def __str__(self):
      return f"""
  <function>
  {self._signature}
      \"\"\"{self.description}\"\"\"
  </function>"""
  
file_path: pandas-ai/pandasai/skills/__init__.py
imports: from pydantic import BaseModel, PrivateAttr
  from typing import Callable, Any, Optional, Union
  import inspect
label_desc: Use image node_id 4 for calling the Skill obj's underlying member method code with example usage: obj.__str__() and returns: str, self, str, self, str